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Red Bull Formula 1 advisor Helmut Marko has called for the sport to introduce an independent engine supply for teams as soon as possible, saying the team's future on the grid is not secure without one.

Red Bull has called for an independent engine supply to be introduced to F1 on numerous occasions, as struggles with power unit partner Renault through 2015 led to quit threats from the four-time champion team.

F1 chiefs are currently working on plans for the sport's engine formula beyond 2020, with key interests including a fall in costs and an increase in noise for the specification used in 2021.

Speaking to the official F1 website, Marko stressed that an independent engine supply for teams was crucial to the sport's future and that of Red Bull as a racing team.

"The latest must be 2021 that an independent engine supplier comes into F1. This is more than necessary - and the engine has to be simple, noisy and on the cost side below 10 million," Marko said.

"We are talking about a much less sophisticated engine to what we have now - a simple racing engine. There are enough companies around that could supply.

"So we expect from the new owners together with the FIA to find a solution at the latest by the end of this season. If that doesn't happen our stay in F1 is not secured."

Red Bull currently sits third in the F1 pecking order behind Ferrari and Mercedes, having struggled to compete with the two pace-setters through the opening trio of races in 2017.

Marko said Red Bull's pace deficiency was down in part to a lack of performance from the Renault power unit used, but is confident that updates fo the RB13 chassis can offer a step in pace.

"We have two problems: Renault had some reliability issues, which have slowed them down in the development, and we didn't deliver the chassis that we should have done," Marko said.

"But we are working day and night to pick up our shortcomings. We are pretty optimistic that we will make a significant step forward in Barcelona where a big change of parts is coming.

"So sometimes patience is the best virtue a driver can have!"

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